std/_crypto_wasm is only for internal use, such as by std/crypto. Its interface may not be stable between releases and it should not be imported directly.

This folder contains Rust code that we use via Wasm. It allows us to take advantage of existing Rust implementations of crypto algorithms such as SHA-1 and use them here in deno_std.

deno task build:crypto

This will regenerate the files in the ./lib/ folder from the Rust source.